Linn County, Missouri
The dominant drainage class is Somewhat poorly drained and the dominant hydrologic group is D (very slow infiltration, high runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Linn County, Missouri.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Armstrong clay loam, 5 to 9 percent slopes, moderately eroded | 100K | Somewhat poorly drained | D | Very limited | Very limited |
| Purdin loam, 9 to 14 percent slopes, eroded | 41K | Moderately well drained | D | Somewhat limited | Very limited |
| Lagonda silt loam, 2 to 5 percent slopes, eroded | 35K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Armstrong loam, 2 to 5 percent slopes, eroded | 34K | Somewhat poorly drained | D | Very limited | Very limited |
| Fatima silt loam, 0 to 2 percent slopes, frequently flooded | 17K | Moderately well drained | C | Very limited | Very limited |
| Vesser silt loam, 0 to 2 percent slopes, occasionally flooded | 14K | Poorly drained | C/D | Very limited | Very limited |
| Blackoar silt loam, 0 to 2 percent slopes, frequently flooded | 13K | Poorly drained | B/D | Very limited | Very limited |
| Portage silty clay, 0 to 2 percent slopes, frequently flooded, frequently ponded | 11K | Very poorly drained | D | Very limited | Very limited |
| Purdin clay loam, 14 to 20 percent slopes, eroded | 10K | Moderately well drained | D | Very limited | Very limited |
| Kilwinning silt loam, 1 to 5 percent slopes | 10K | Poorly drained | C/D | Very limited | Very limited |
| Grundy silt loam, 2 to 5 percent slopes | 9K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Chequest silty clay loam, 0 to 2 percent slopes, frequently flooded | 9K | Poorly drained | C | Very limited | Very limited |
| Leonard silt loam, 1 to 6 percent slopes, eroded | 9K | Poorly drained | C/D | Very limited | Very limited |
| Winnegan loam, 20 to 35 percent slopes | 7K | Moderately well drained | D | Very limited | Very limited |
| Winnegan clay loam, 14 to 20 percent slopes, eroded | 7K | Moderately well drained | D | Very limited | Very limited |
| Keswick clay loam, 5 to 9 percent slopes, eroded | 7K | Moderately well drained | D | Very limited | Very limited |
| Purdin clay loam, 9 to 14 percent slopes, severely eroded | 6K | Moderately well drained | D | Somewhat limited | Very limited |
| Blackoar silt loam, 1 to 4 percent slopes, frequently flooded | 5K | Poorly drained | B/D | Very limited | Very limited |
| Zook silty clay loam, heavy till, 0 to 2 percent slopes, occasionally flooded | 5K | Poorly drained | D | Very limited | Very limited |
| Colo silty clay loam, drainageway, 2 to 5 percent slopes, frequently flooded | 4K | Poorly drained | C/D | Very limited | Very limited |
What This Means
Building & Foundations
About 86% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 100% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.